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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional paid-in capital [Member]
Retained Earnings [Member]
Accumulated other comprehensive income (loss) [Member]
Treasury stock [Member]
Preferred Stock [Member]
Preferred Stock, Shares Outstanding 8,000            
Beginning of year at Dec. 31, 2020   $ 208,066 $ 438,985 $ 2,271,537 $ 220,186 $ (599,885) $ 200,000
Issuance of preferred stock             0
Dividend reinvestment plan   13 429        
Stock purchase and compensation plans   497 6,996        
Net income $ 109,270     109,270      
Dividends to preferred stockholders       (2,453)      
Dividends to common stockholders       (15,165)      
Other comprehensive loss (85,586)       (85,586)    
Acquisition of treasury stock - share repurchase authorization           (3,404)  
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans           (5,441)  
End of period at Mar. 31, 2021 $ 2,744,045 208,576 446,410 2,363,189 134,600 (608,730) $ 200,000
Dividends declared per share to preferred stockholders $ 306.67            
Dividends declared per share to common stockholders $ 0.25            
Preferred stock, shares outstanding             0
Common stock, shares outstanding, beginning of period at Dec. 31, 2020 59,905,803            
Dividend reinvestment plan, shares 6,420            
Stock purchase and compensation plan, shares 248,459            
Acquisition of treasury stock, share repurchase authorization (52,781)            
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (84,018)            
Common stock, shares outstanding, end of period at Mar. 31, 2021 60,023,883            
Preferred Stock, Shares Outstanding 8,000            
Preferred Stock, Shares Outstanding 8,000            
Beginning of year at Dec. 31, 2021 $ 2,982,885 208,902 464,347 2,603,472 115,099 (608,935) $ 200,000
Issuance of preferred stock             0
Dividend reinvestment plan   11 443        
Stock purchase and compensation plans   423 8,000        
Net income 56,330     56,330      
Dividends to preferred stockholders       (2,300)      
Dividends to common stockholders       (17,065)      
Other comprehensive loss (244,894)       (244,894)    
Acquisition of treasury stock - share repurchase authorization           (76)  
Acquisition of treasury stock - shares acquired related to employee-share based compensation plans           (5,516)  
End of period at Mar. 31, 2022 $ 2,778,241 $ 209,336 $ 472,790 $ 2,640,437 $ (129,795) $ (614,527) $ 200,000
Dividends declared per share to preferred stockholders $ 287.50            
Dividends declared per share to common stockholders $ 0.28            
Preferred stock, shares outstanding             0
Common stock, shares outstanding, beginning of period at Dec. 31, 2021 60,184,382            
Dividend reinvestment plan, shares 5,641            
Stock purchase and compensation plan, shares 218,442            
Acquisition of treasury stock, share repurchase authorization (71,993)            
Acquisition of treasury stock - shares acquired related to employee share-based compensation plans (1,000)            
Common stock, shares outstanding, end of period at Mar. 31, 2022 60,335,472            
Preferred Stock, Shares Outstanding 8,000